21123773343 has 24 divisors (see below), whose sum is σ = 30671327232. Its totient is φ = 14009128848.

The previous prime is 21123773329. The next prime is 21123773357. The reversal of 21123773343 is 34337732112.

21123773343 is a `hidden beast` number, since 2 + 11 + 237 + 73 + 343 = 666.

It is an interprime number because it is at equal distance from previous prime (21123773329) and next prime (21123773357).

It is not a de Polignac number, because 21123773343 - 2¹⁷ = 21123642271 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21123773298 and 21123773307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21123773743) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3575530 + ... + 3581432.

It is an arithmetic number, because the mean of its divisors is an integer number (1277971968).

Almost surely, 2^21123773343 is an apocalyptic number.

21123773343 is a deficient number, since it is larger than the sum of its proper divisors (9547553889).

21123773343 is a wasteful number, since it uses less digits than its factorization.

21123773343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7915 (or 7912 counting only the distinct ones).

The product of its digits is 63504, while the sum is 36.

The spelling of 21123773343 in words is "twenty-one billion, one hundred twenty-three million, seven hundred seventy-three thousand, three hundred forty-three".